Pair Cascades and Deathlines in Magnetic Fields with Offset Polar Caps

Details Pair Cascades and Deathlines in Magnetic Fields with Offset Polar Caps Pair Cascades and Deathlines in Magnetic Fields with Offset Polar Caps

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1357..221h&link_type=abstract

RADIO PULSARS: AN ASTROPHYSICAL KEY TO UNLOCK THE SECRETS OF THE UNIVERSE. AIP Conference Proceedings, Volume 1357, pp. 221-224

Astronomy and Astrophysics

Astrophysics

Electric Fields, Cosmic Rays, Stellar Rotation, Telescopes, Magnetic And Electric Fields, Polarization Of Starlight, Cosmic Rays, Stellar Rotation, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

We present results of electron-positron pair cascade simulations in a dipole magnetic field whose polar cap is offset from the dipole axis. In such a field geometry, the polar cap is displaced a small fraction of the neutron star radius from the star symmetry axis and the field line radius of curvature is modified. Using the modified parallel electric field near the offset polar cap, we simulate pair cascades to determine the pair deathlines and pair multiplicities as a function of the offset. We find that the pair multiplicity can change dramatically with a modest offset, with a significant increase on one side of the polar cap. Lower pair deathlines allow a larger fraction of the pulsar population, that include old and millisecond pulsars, to produce cascades with high multiplicity. The results have some important implications for pulsar particle production, high-energy emission and cosmic-ray contribution.

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